Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  Remove use of Thread.sleep
  Use logger built-in format

Change-Id: Id0c679494b7132fc6f21bc820817d0ed1c176802
diff --git a/src/main/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatConfig.java b/src/main/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatConfig.java
index 07f9c43..4031a4e 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatConfig.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatConfig.java
@@ -52,7 +52,7 @@
   private void load(File configPath) throws ConfigInvalidException, IOException {
     FileBasedConfig cfg = new FileBasedConfig(configPath, FS.DETECTED);
     if (!cfg.getFile().exists() || cfg.getFile().length() == 0) {
-      logger.debug("No " + cfg.getFile() + " or empty; using all default values");
+      logger.debug("No {} or empty; using all default values", cfg.getFile());
       return;
     }
 
diff --git a/src/main/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatDaemon.java b/src/main/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatDaemon.java
index ff7f6b4..c665c7a 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatDaemon.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatDaemon.java
@@ -52,7 +52,7 @@
   @Override
   public void start() {
     timer.schedule(new HeartbeatTask(), 0, config.getDelay());
-    logger.info("Initialized to send heartbeat event every " + config.getDelay() + " milliseconds");
+    logger.info("Initialized to send heartbeat event every {} milliseconds", config.getDelay());
   }
 
   @Override
diff --git a/src/test/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatDaemonTest.java b/src/test/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatDaemonTest.java
index 3aec912..765daac 100644
--- a/src/test/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatDaemonTest.java
+++ b/src/test/java/com/ericsson/gerrit/plugins/heartbeat/HeartbeatDaemonTest.java
@@ -29,6 +29,7 @@
 import com.google.gwtorm.client.KeyUtil;
 import com.google.gwtorm.server.SchemaFactory;
 import com.google.gwtorm.server.StandardKeyEncoder;
+import java.util.concurrent.TimeUnit;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -66,7 +67,7 @@
     replay(eventDispatcherMock);
 
     heartbeatDaemon.start();
-    Thread.sleep(500);
+    TimeUnit.MILLISECONDS.sleep(500);
     verify(eventDispatcherMock);
     heartbeatDaemon.stop();
   }